Amplifier



FIG. 1 is a perspective view of an amplifier according to my new design;

FIG. 2 is a front elevational view of the amplifier of FIG. 1.

FIG. 3 is a rear elevational view of the amplifier of FIG. 1;

FIG. 4 is a left side elevational view of the amplifier of FIG. 1;

FIG. 5 is a right side elevational view of the amplifier of FIG. 1;

FIG. 6 is a top plan view of the amplifier of FIG. 1; and,

FIG. 7 is a bottom plan view of the amplifier of FIG. 1.

The broken lines of FIG. 3 are for illustrative purposes only and form no part of the claimed design. 

I claim the ornamental design for an amplifier, as shown and described. 